Most of my friends are either from college or from doing independent films locally. Also friends of friends who became friends of my own. Then friends I met on Facebook where we became friends in real life. It all came down to common interests, common goals, and common beliefs.
I've never really become friends with anyone I knew at work, even though we'd be on friendly terms, and I didn't have that many friends in high school. Of the ones who were my friends, we drifted apart over 20 years ago.
Through regular get-togethers and a better developed Internet community, I never lost touch with friends from college. I didn't have either of those in high school. When I went online towards the end of high school, I wasn't keeping touch with anyone I knew on there. The difference between the Internet now and back then is like night and day.
The Internet in 1996 or 1997 wasn't of much use to me beyond things like seeing Kirk vs. Picard Debates, finding out what the Enterprise-E looks like (!!!), finding out Voyager was finally leaving the Kazon behind, and reading Tim Lynch reviews. And posting for the first time on Psi Phi, where I used to post before TrekBBS. I've been posting as Lord Garth since high school.